Ram bulletin 18-071-26
What it saysFlash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes… NHTSA’s full summary ↓
Ram filed this with NHTSA as a service bulletin dated Jul 22, 2026, received Jul 29, 2026, about the power train. It names 1 model year (2025). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationFlash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **U0104-00 - Lost Communication With Cruise Control Module (NA Market Only) (In Active or Stored status). ● U0405-00 - Invalid Data Received From Cruise Control Module (NA Market Only) (In Active or Stored status). NOTE: Vehicles setting DTCs U0405-00 and U0104-00 may experience an inability to be cleared.** ● P06DD-00 - Engine Oil Pressure Control Circuit Performance/Stuck Off. ● P0073-00 - Ambient Air Temperature Sensor Circuit "A" High. ● P0071-00 - Ambient Air Temperature Sensor Performance. ● P2C90-00 - Crankcase Ventilation System - Hose "A" Disconnected. ● P1CEA-00 - Boost Side EVAP Purge System Performance. ● P05BD-00 - Stop-start Mode Switch Range/Performance. ● P00C6-00 - Fuel Rail Pressure Too Low - Engine Cranking. ● U0673-00 - Lost Communication With Ion Sense Module. ● P00C6-00 - Fuel Rail Pressure Too Low - Engine Cranking - in ACTIVE or STORED status. ● P0325-00 - Knock/Combustion Vibration Sensor 1 Circuit - in ACTIVE or STORED status. ● P0330-00 - Knock/Combustion Vibration Sensor 2 Circuit - in ACTIVE or STORED status. ● P032A-00 - Knock-Combustion Vibration Sensor C Circuit - in ACTIVE or STORED status. ● P018B-00 - Fuel Pressure Sensor "B" Circuit Range/Performance - in ACTIVE or STORED status. ● P2AF6-00 - Starter Relay 3 Stuck Off - in ACTIVE or STORED status. ● P0300-00 - Multiple Cylinder Misfire - in ACTIVE or STORED status set during cold start catalyst heating. ● P0301-00 - Cylinder 1 Misfire - in ACTIVE or STORED status set during cold start catalyst heating. ● P0302-00 - Cylinder 2 Misfire - in ACTIVE or STORED status set during cold start catalyst heating. ● P0303-00 - Cylinder 3 Misfire - in ACTIVE or STORED status set during cold start catalyst heating. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
Trouble codes it names: U0104 U0405 all 2 read from the document itself; NHTSA’s summary names none
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 18-071-26 | Service bulletin | Jul 22, 2026 | 11035321 |
What the document itself lists
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 18-19-06-L3 | Module, Powertrain Control Module (PCM) - Inspect | 0.2 hrs |
| 18-19-06-L4 | Module, Powertrain Control Module (PCM) - Inspect and Reprogram | 0.3 hrs |
Read by machine from the document NHTSA serves (5 pages), read Sep 29, 2026. A part number is shown only where it matches Ram’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 1 model year this bulletin names have filed 356 complaints with NHTSA since 2015. 48 of them name Power Train — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the power train
Source: same model, same component group70 other manufacturer communications filed against the Ram 1500 under the same component group (power train), newest first. The eight newest are listed; the rest are on the Ram list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 21-062-26 | Service bulletin | Sep 25, 2026 | Transmission Rattle Customers may comment on the following: SYMPTOM: ● Rattle noise coming from the transmission. This bulletin involves ins… |
| 21-057-26 | Service bulletin | Jul 9, 2026 | Flash: Transmission Control Module (TCM) Updates Customers may comment on one or more of the following: SYMPTOM: ● Harsh or slipping feeling… |
| 21-056-26 | Service bulletin | Jul 9, 2026 | Flash: Transmission Control Module (TCM) Updates Customers may comment on one or more of the following: SYMPTOM: ● **Harsh or slipping feeli… |
| 21-055-26 | Service bulletin | Jul 9, 2026 | Flash: Transmission Control Module (TCM) Updates Customers may comment on one or more of the following: SYMPTOM: ● Harsh or slipping feeling… |
| 21-054-26 | Service bulletin | Jul 9, 2026 | Flash: Transmission Control Module (TCM) Updates Customers may comment on one or more of the following: SYMPTOM: ● Harsh or slipping feeling… |
| 112748 | Service bulletin | Jun 11, 2026 | SHIFTER - TRANSMISSION |
| 112747 | Service bulletin | Jun 11, 2026 | SHIFTER - TRANSMISSION |
| 18-059-26 | Service bulletin | Jun 6, 2026 | Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle mus… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Ram, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Ram 18-071-26 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 18-071-26 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 18-071-26 cover?
The manufacturer filed it against 1 model year: 2025 Ram 1500. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.